This 58-400 polypropylene (P/P) continuous thread closure has a ribbed skirt and a matte (stipple) top. It also has a stack feature for packages being sold in a retail sales environment. It includes an F-217 foam liner. The F-217 foam liner is chemical and odor resistant and provides a low moisture transmission rate.

Note that a foam liner does not provide the consumer any indication of tampering (tamper evidency).